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Differences between male and female skulls. The red arrow indicates frontal bossing, which is consistently more apparent in male skulls; the nasal radix (green arrow) is consequently deeper in the male skull. The yellow arrow demonstrates greater prominence of the chin in the male skull, and the blue arrows show a greater mandibular height in the male as well. In this example, the male skull has a more obtuse mandibular angle (purple arrow) than the female skull, which is atypical, illustrating the important point that not all of the listed sexually dimorphic traits are found in all patients. Contributed by Marc H Hohman, MD, FACS